Raise -boring, being a highly mechanized method in raise excavating, have been used widely in other countries.
钻进法是掘进天井的一种机械化程度较高的施工方法，国外已广泛使用。
The raise boring is a new raising method deployed in China's mines in1980s.
天井钻进法是我国矿山于80年代推广应用的天井掘进新方法。
The raise boring is a new raising method deployed in China's mines in1980s.
天井钻进法是我国矿山于80年代推广应用的天井掘进新方法。
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